Class: Msf::Modules::Loader::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/msf/core/modules/loader/base.rb

Overview

Direct Known Subclasses

Directory, Executable

Constant Summary collapse

DIRECTORY_BY_TYPE =

Not all types are pluralized when a directory name, so here’s the mapping that currently exists

{
  Msf::MODULE_AUX => 'auxiliary',
  Msf::MODULE_ENCODER => 'encoders',
  Msf::MODULE_EXPLOIT => 'exploits',
  Msf::MODULE_NOP => 'nops',
  Msf::MODULE_PAYLOAD => 'payloads',
  Msf::MODULE_POST => 'post',
  Msf::MODULE_EVASION => 'evasion'
}
TYPE_BY_DIRECTORY =
DIRECTORY_BY_TYPE.invert
NAMESPACE_MODULE_LINE =

This must calculate the first line of the NAMESPACE_MODULE_CONTENT string so that errors are reported correctly

__LINE__ + 4
NAMESPACE_MODULE_CONTENT =

By calling module_eval from inside the module definition, the lexical scope is captured and available to the code in module_content.

<<-EOS
  class << self
    # The loader that originally loaded this module
    #
    # @return [Msf::Modules::Loader::Base] the loader that loaded this namespace module and can reload it.
    attr_accessor :loader

    # @return [String] The path under which the module of the given type was found.
    attr_accessor :parent_path
  end

  # Calls module_eval on the module_content, but the lexical scope of the namespace_module is passed through
  # module_eval, so that module_content can act like it was written inline in the namespace_module.
  #
  # @param [String] module_content The content of the {Msf::Module}.
  # @param [String] module_path The path to the module, so that error messages in evaluating the module_content can
  #   be reported correctly.
  def self.module_eval_with_lexical_scope(module_content, module_path)
    # By calling module_eval from inside the module definition, the lexical scope is captured and available to the
    # code in module_content.
    module_eval(module_content, module_path)
  end
EOS
MODULE_EXTENSION =

The extension for metasploit modules.

'.rb'
MODULE_SEPARATOR =

String used to separate module names in a qualified module name.

'::'
NAMESPACE_MODULE_NAMES =

The base namespace name under which namespace modules are created.

['Msf', 'Modules']
UNIT_TEST_REGEX =

Regex that can distinguish regular ruby source from unit test source.

/rb\.(ut|ts)\.rb$/

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(module_manager) ⇒ Base

Returns a new instance of Base.

Parameters:

  • module_manager (Msf::ModuleManager)

    The module manager that caches the loaded modules.



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# File 'lib/msf/core/modules/loader/base.rb', line 65

def initialize(module_manager)
  @module_manager = module_manager
end

Instance Attribute Details

#module_managerMsf::ModuleManager (readonly, protected)

Returns The module manager for which this loader is loading modules.

Returns:



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# File 'lib/msf/core/modules/loader/base.rb', line 451

def module_manager
  @module_manager
end

Class Method Details

.reverse_relative_name(relative_name) ⇒ String (protected)

This reverses a namespace module’s relative name to a module full name

Parameters:

  • relative_name (String)

    The namespace module's relative name

Returns:

  • (String)

    The module full name

See Also:



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# File 'lib/msf/core/modules/loader/base.rb', line 533

def self.reverse_relative_name(relative_name)
  relative_name.split('__').map(&:downcase).join('/')
end

.typed_path(type, module_reference_name) ⇒ String (protected)

The path to the module qualified by the type directory.

Parameters:

  • type (String)

    The type of the module.

  • module_reference_name (String)

    The canonical name for the module.

Returns:

  • (String)

    path to the module starting with the type directory.

See Also:



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# File 'lib/msf/core/modules/loader/base.rb', line 639

def self.typed_path(type, module_reference_name)
  file_name = module_reference_name + MODULE_EXTENSION
  type_directory = DIRECTORY_BY_TYPE[type]
  typed_path = File.join(type_directory, file_name)

  typed_path
end

Instance Method Details

#create_namespace_module(namespace_module_names) ⇒ Module (protected)

Returns a nested module to wrap the MetasploitModule class so that it doesn’t overwrite other (metasploit) module’s classes. The wrapper module must be named so that active_support’s autoloading code doesn’t break when searching constants from inside the Metasploit class.

Parameters:

Returns:

See Also:



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# File 'lib/msf/core/modules/loader/base.rb', line 354

def create_namespace_module(namespace_module_names)
  # In order to have constants defined in Msf resolve without the Msf qualifier in the module_content, the
  # Module.nesting must resolve for the entire nesting. Module.nesting is strictly lexical, and can't be faked with
  # module_eval(&block). (There's actually code in ruby's implementation to stop module_eval from being added to
  # Module.nesting when using the block syntax.) All this means is the modules have to be declared as a string that
  # gets module_eval'd.

  nested_module_names = namespace_module_names.reverse

  namespace_module_content = nested_module_names.inject(NAMESPACE_MODULE_CONTENT) { |wrapped_content, module_name|
    lines = []
    lines << "module #{module_name}"
    lines << wrapped_content
    lines << "end"

    lines.join("\n")
  }

  # - because the added wrap lines have to act like they were written before NAMESPACE_MODULE_CONTENT
  line_with_wrapping = NAMESPACE_MODULE_LINE - nested_module_names.length
  Object.module_eval(namespace_module_content, __FILE__, line_with_wrapping)

  # The namespace_module exists now, so no need to use constantize to do const_missing
  namespace_module = current_module(namespace_module_names)
  # record the loader, so that the namespace module and its metasploit_class can be reloaded
  namespace_module.loader = self

  namespace_module
end

#current_module(module_names) ⇒ Module? (protected)

Returns the module with ‘module_names` if it exists.

Parameters:

  • module_names (Array<String>)

    a list of module names to resolve from Object downward.

Returns:

  • (Module)

    module that wraps the previously loaded content from #read_module_content.

  • (nil)

    if any module name along the chain does not exist.



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# File 'lib/msf/core/modules/loader/base.rb', line 389

def current_module(module_names)
  # Don't want to trigger ActiveSupport's const_missing, so can't use constantize.
  named_module = module_names.reduce(Object) do |parent, module_name|
    # Since we're searching parent namespaces first anyway, this is
    # semantically equivalent to providing false for the 1.9-only
    # "inherit" parameter to const_defined?. If we ever drop 1.8
    # support, we can save a few cycles here by adding it back.
    return unless parent.const_defined?(module_name)
    parent.const_get(module_name)
  end

  named_module
end

#each_module_reference_name(path) {|parent_path, type, module_reference_name| ... } ⇒ void (protected)

This method is abstract.

Override and search the path for modules.

This method returns an undefined value.

Yields module reference names under path.

Parameters:

  • path (String)

    Path under which there are modules

Yields:

  • (parent_path, type, module_reference_name)

    Gives the path and the module_reference_name of the module found under the path.

Yield Parameters:

  • parent_path (String)

    the path under which the module of the given type was found.

  • type (String)

    the type of the module.

  • module_reference_name (String)

    The canonical name for referencing the module.

Raises:

  • (::NotImplementedError)


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# File 'lib/msf/core/modules/loader/base.rb', line 414

def each_module_reference_name(path)
  raise ::NotImplementedError
end

#load_error(module_path, error) ⇒ void (protected)

This method returns an undefined value.

Records the load error to Msf::ModuleManager::Loading#module_load_error_by_path and the log.

Parameters:

  • module_path (String)

    Path to the module as returned by #module_path.

  • error (Exception, #class, #to_s, #backtrace)

    the error that cause the module not to load.

See Also:



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# File 'lib/msf/core/modules/loader/base.rb', line 425

def load_error(module_path, error)
  # module_load_error_by_path does not get the backtrace because the value is echoed to the msfconsole where
  # backtraces should not appear.
  module_manager.module_load_error_by_path[module_path] = "#{error.class} #{error}"

  elog("#{module_path} failed to load", error: error)
end

#load_module(parent_path, type, module_reference_name, options = {}) ⇒ false, true

Loads a module from the supplied path and module_reference_name.

Parameters:

  • parent_path (String)

    The path under which the module exists. This is not necessarily the same path as passed to #load_modules: it may just be derived from that path.

  • type (String)

    The type of module.

  • module_reference_name (String)

    The canonical name for referring to the module.

  • options (Hash) (defaults to: {})

    Options used to force loading and track statistics

Options Hash (options):

  • :count_by_type (Hash{String => Integer})

    Maps the module type to the number of module loaded

  • :force (Boolean) — default: false

    whether to force loading of the module even if the module has not changed.

  • :recalculate_by_type (Hash{String => Boolean})

    Maps type to whether its Msf::ModuleManager::ModuleSets#module_set needs to be recalculated.

  • :reload (Boolean) — default: false

    whether this is a reload.

Returns:

  • (false)

    if :force is false and parent_path has not changed.

  • (false)

    if exception encountered while parsing module content

  • (false)

    if the module is incompatible with the Core or API version.

  • (false)

    if the module does not implement a Metasploit class.

  • (false)

    if the module's is_usable method returns false.

  • (true)

    if all those condition pass and the module is successfully loaded.

See Also:



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# File 'lib/msf/core/modules/loader/base.rb', line 110

def load_module(parent_path, type, module_reference_name, options = {})
  options.assert_valid_keys(:count_by_type, :force, :recalculate_by_type, :reload, :cached_metadata)
  force = options[:force] || false
  reload = options[:reload] || false

  if options[:cached_metadata]
    module_path = options[:cached_metadata].path
  else
    module_path = self.module_path(parent_path, type, module_reference_name)
  end

  file_changed = module_manager.file_changed?(module_path)

  unless force or file_changed
    dlog("Cached module from #{module_path} has not changed.", 'core', LEV_2)

    return false
  end

  reload ||= force || file_changed

  module_content = read_module_content_from_path(module_path)

  if module_content.empty?
    # read_module_content is responsible for calling {#load_error}, so just return here.
    return false
  end

  klass = nil
  try_eval_module = lambda { |namespace_module|
    # set the parent_path so that the module can be reloaded with #load_module
    namespace_module.parent_path = parent_path

    begin
      namespace_module.module_eval_with_lexical_scope(module_content, module_path)
    # handle interrupts as pass-throughs unlike other Exceptions so users can bail with Ctrl+C
    rescue ::Interrupt
      raise
    rescue ::Exception => error
      load_error(module_path, error)
      return false
    end

    if namespace_module.const_defined?('Metasploit3', false)
      klass = namespace_module.const_get('Metasploit3', false)
      load_warning(module_path, "Please change the module's class name from Metasploit3 to MetasploitModule")
    elsif namespace_module.const_defined?('Metasploit4', false)
      klass = namespace_module.const_get('Metasploit4', false)
      load_warning(module_path, "Please change the module's class name from Metasploit4 to MetasploitModule")
    elsif namespace_module.const_defined?('MetasploitModule', false)
      klass = namespace_module.const_get('MetasploitModule', false)
    else
      load_error(module_path, Msf::Modules::Error.new(
        module_path:           module_path,
        module_reference_name: module_reference_name,
        causal_message:        'invalid module class name (must be MetasploitModule)'
      ))
      return false
    end

    if reload
      ilog("Reloading #{type} module #{module_reference_name}. Ambiguous module warnings are safe to ignore", 'core', LEV_2)
    else
      ilog("Loaded #{type} module #{module_reference_name} under #{parent_path}", 'core', LEV_2)
    end

    module_manager.module_load_error_by_path.delete(module_path)

    true
  }

  begin
    loaded = namespace_module_transaction("#{type}/#{module_reference_name}", reload: reload, &try_eval_module)
    return false unless loaded
  rescue NameError
    load_error(module_path, Msf::Modules::Error.new(
      module_path:           module_path,
      module_reference_name: module_reference_name,
      causal_message:        'invalid module filename (must be lowercase alphanumeric snake case)'
    ))
    return false
  rescue => e
    load_error(module_path, Msf::Modules::Error.new(
      module_path:           module_path,
      module_reference_name: module_reference_name,
      causal_message:        "unknown error #{e.message}"
    ))
    return false
  end


  # Do some processing on the loaded module to get it into the right associations
  module_manager.on_module_load(
      klass,
      type,
      module_reference_name,
      {
          # files[0] is stored in the {Msf::Module#file_path} and is used to reload the module, so it needs to be a
          # full path
          'files' => [
              module_path
          ],
          'paths' => [
              module_reference_name
          ],
          'type' => type,
          'cached_metadata' => options[:cached_metadata]
      }
  )

  # Set this module type as needing recalculation
  recalculate_by_type = options[:recalculate_by_type]

  if recalculate_by_type
    recalculate_by_type[type] = true
  end

  # The number of loaded modules this round
  count_by_type = options[:count_by_type]

  if count_by_type
    count_by_type[type] ||= 0
    count_by_type[type] += 1
  end

  return true
end

#load_modules(path, options = {}) ⇒ Hash{String => Integer}

Note:

Only paths where #loadable? returns true should be passed to this method.

Loads all of the modules from the supplied path.

Parameters:

  • path (String)

    Path under which there are modules

  • options (Hash) (defaults to: {})

Options Hash (options):

  • force (Boolean) — default: false

    Whether to force loading of the module even if the module has not changed.

  • whitelist (Array)

    An array of regex patterns to search for specific modules

Returns:

  • (Hash{String => Integer})

    Maps module type to number of modules loaded



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# File 'lib/msf/core/modules/loader/base.rb', line 250

def load_modules(path, options={})
  options.assert_valid_keys(:force, :recalculate)

  force = options[:force]
  count_by_type = {}
  recalculate_by_type = {}

  each_module_reference_name(path, options) do |parent_path, type, module_reference_name|
    load_module(
        parent_path,
        type,
        module_reference_name,
        :recalculate_by_type => recalculate_by_type,
        :count_by_type => count_by_type,
        :force => force
    )
  end
  if options[:recalculate]
    recalculate_by_type.each do |type, recalculate|
      if recalculate
        module_set = module_manager.module_set(type)
        module_set.recalculate
      end
    end
  end

  count_by_type
end

#load_warning(module_path, error) ⇒ void (protected)

This method returns an undefined value.

Records the load warning to Msf::ModuleManager::Loading#module_load_warnings and the log.

Parameters:

  • module_path (String)

    Path to the module as returned by #module_path.

  • error (String)

    Error message that caused the warning.

See Also:



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# File 'lib/msf/core/modules/loader/base.rb', line 440

def load_warning(module_path, error)
  module_manager.module_load_warnings[module_path] = error.to_s

  log_lines = []
  log_lines << "#{module_path} generated a warning during load:"
  log_lines << error.to_s
  log_message = log_lines.join(' ')
  wlog(log_message)
end

#loadable?(path) ⇒ Boolean

This method is abstract.

Override and determine from properties of the path or the file to which the path points whether it is loadable using #load_modules for the subclass.

Returns whether the path can be loaded this module loader.

Parameters:

  • path (String)

    Path under which there are modules

Returns:

  • (Boolean)

Raises:

  • (::NotImplementedError)


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# File 'lib/msf/core/modules/loader/base.rb', line 77

def loadable?(path)
  raise ::NotImplementedError
end

#module_path(parent_path, type, module_reference_name) ⇒ String (protected)

This method is abstract.

Override to return the path to the module on the file system so that errors can be reported correctly.

Returns path to module that can be used for reporting errors in evaluating the module_content.

Parameters:

  • parent_path (String)

    The path under which the module exists. This is not necessarily the same path as passed to #load_modules: it may just be derived from that path.

  • type (String)

    The type of module.

  • module_reference_name (String)

    The canonical name for referring to the module.

Returns:

  • (String)

    The path to module.

Raises:

  • (::NotImplementedError)


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# File 'lib/msf/core/modules/loader/base.rb', line 462

def module_path(parent_path, type, module_reference_name)
  raise ::NotImplementedError
end

#module_path?(path) ⇒ true, false (protected)

Returns whether the path could refer to a module. The path would still need to be loaded in order to check if it actually is a valid module.

Parameters:

  • path (String)

    to module without the type directory.

Returns:

  • (true)

    if the extname is MODULE_EXTENSION AND the path does not match UNIT_TEST_REGEX AND the path is not hidden (starts with '.')

  • (false)

    otherwise



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# File 'lib/msf/core/modules/loader/base.rb', line 474

def module_path?(path)
  path.ends_with?(MODULE_EXTENSION) &&
    File.file?(path) &&
    !path.starts_with?(".") &&
    !path.match?(UNIT_TEST_REGEX) &&
    !script_path?(path)
end

#module_reference_name_from_path(path) ⇒ String (protected)

Changes a file name path to a canonical module reference name.

Parameters:

  • path (String)

    Relative path to module.

Returns:



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# File 'lib/msf/core/modules/loader/base.rb', line 493

def module_reference_name_from_path(path)
  path.gsub(/#{MODULE_EXTENSION}$/, '')
end

#namespace_module_name(module_full_name) ⇒ String (protected)

Returns the fully-qualified name to the #create_namespace_module that wraps the module with the given module reference name.

Parameters:

  • module_full_name (String)

    The canonical name for referring to the module.

Returns:

  • (String)

    name of module.

See Also:



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# File 'lib/msf/core/modules/loader/base.rb', line 506

def namespace_module_name(module_full_name)
  namespace_module_names = self.namespace_module_names(module_full_name)
  namespace_module_name = namespace_module_names.join(MODULE_SEPARATOR)

  namespace_module_name
end

#namespace_module_names(module_full_name) ⇒ Array<String> (protected)

Returns an Array of names to make a fully qualified module name to wrap the MetasploitModule class so that it doesn’t overwrite other (metasploit) module’s classes.

Parameters:

  • module_full_name (String)

    The unique canonical name for the module including type.

Returns:

See Also:

  • namespace_module


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# File 'lib/msf/core/modules/loader/base.rb', line 522

def namespace_module_names(module_full_name)
  relative_name = module_full_name.split('/').map(&:capitalize).join('__')
  NAMESPACE_MODULE_NAMES + [relative_name]
end

#namespace_module_transaction(module_full_name, options = {}, &block) ⇒ Object (protected)



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# File 'lib/msf/core/modules/loader/base.rb', line 537

def namespace_module_transaction(module_full_name, options={}, &block)
  options.assert_valid_keys(:reload)

  reload = options[:reload] || false
  namespace_module_names = self.namespace_module_names(module_full_name)

  previous_namespace_module = current_module(namespace_module_names)

  if previous_namespace_module and not reload
    elog("Reloading namespace_module #{previous_namespace_module} when :reload => false")
  end

  relative_name = namespace_module_names.last

  if previous_namespace_module
    parent_module = previous_namespace_module.module_parent
    # remove_const is private, so use send to bypass
    parent_module.send(:remove_const, relative_name)
  end

  namespace_module = create_namespace_module(namespace_module_names)
  # Get the parent module from the created module so that
  # restore_namespace_module can remove namespace_module's constant if
  # needed.
  parent_module = namespace_module.module_parent

  begin
    loaded = block.call(namespace_module)
  rescue Exception
    restore_namespace_module(parent_module, relative_name, previous_namespace_module)

    # re-raise the original exception in the original context
    raise
  else
    unless loaded
      restore_namespace_module(parent_module, relative_name, previous_namespace_module)
    end

    loaded
  end
end

#read_module_content(parent_path, type, module_reference_name) ⇒ String (protected)

This method is abstract.

Override to read the module content based on the method of the loader subclass and return a string.

Read the content of the module from under path.

Parameters:

  • parent_path (String)

    The path under which the module exists. This is not necessarily the same path as passed to #load_modules: it may just be derived from that path.

  • type (String)

    The type of module.

  • module_reference_name (String)

    The canonical name for referring to the module.

Returns:

Raises:

  • (::NotImplementedError)


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# File 'lib/msf/core/modules/loader/base.rb', line 587

def read_module_content(parent_path, type, module_reference_name)
  raise ::NotImplementedError
end

#read_module_content_from_path(full_path) ⇒ String (protected)

This method is abstract.

Override to read the module content based on the method of the loader subclass and return a string.

Read the content of a module

Parameters:

  • full_path

    Path to the module to be read

Returns:

Raises:

  • (::NotImplementedError)


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# File 'lib/msf/core/modules/loader/base.rb', line 597

def read_module_content_from_path(full_path)
  raise ::NotImplementedError
end

#reload_module(original_metasploit_class_or_instance) ⇒ Class, Msf::Module

Reloads the specified module.

Parameters:

  • original_metasploit_class_or_instance (Class, Msf::Module)

    either an instance of a module or a module class. If an instance is given, then the datastore will be copied to the new instance returned by this method.

Returns:

  • (Class, Msf::Module)

    original_metasploit_class_or_instance if an instance of the reloaded module cannot be created.

  • (Msf::Module)

    new instance of original_metasploit_class with datastore copied from original_metasploit_instance.



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# File 'lib/msf/core/modules/loader/base.rb', line 287

def reload_module(original_metasploit_class_or_instance)
  if original_metasploit_class_or_instance.is_a? Msf::Module
    original_metasploit_instance = original_metasploit_class_or_instance
    original_metasploit_class = original_metasploit_class_or_instance.class
  else
    original_metasploit_instance = nil
    original_metasploit_class = original_metasploit_class_or_instance
  end

  namespace_module = original_metasploit_class.module_parent
  parent_path = namespace_module.parent_path

  type = original_metasploit_class.type
  module_reference_name = original_metasploit_class.refname
  module_fullname = original_metasploit_class.fullname
  module_used_name = original_metasploit_instance.fullname if original_metasploit_instance

  dlog("Reloading module #{module_fullname}...", 'core')

  if load_module(parent_path, type, module_reference_name, :force => true, :reload => true)
    # Create a new instance of the module, using the alias if one was used
    reloaded_module_instance = module_manager.create(module_used_name || module_fullname)
    if !reloaded_module_instance && module_fullname != module_used_name
      reloaded_module_instance = module_manager.create(module_fullname)
      reloaded_module_instance&.add_warning "Alias #{module_used_name} no longer available after reloading, using #{module_fullname}"
    end

    if reloaded_module_instance
      if original_metasploit_instance
        # copy over datastore
        reloaded_module_instance.datastore.update(original_metasploit_instance.datastore)
      end
    else
      elog("Failed to create instance of #{original_metasploit_class_or_instance.refname} after reload.")

      # Return the old module instance to avoid an strace trace
      return original_metasploit_class_or_instance
    end
  else
    elog("Failed to reload #{module_fullname}")

    return nil
  end

  # Let the specific module sets have an opportunity to handle the fact
  # that this module was reloaded.
  module_set = module_manager.module_set(type)
  module_set.on_module_reload(reloaded_module_instance)

  # Rebuild the cache for just this module
  module_manager.refresh_cache_from_module_files(reloaded_module_instance)

  reloaded_module_instance
end

#restore_namespace_module(parent_module, relative_name, namespace_module) ⇒ void (protected)

This method returns an undefined value.

Restores the namespace module to its original name under its original parent Module if there was a previous namespace module.

Parameters:

  • parent_module (Module)

    The .parent of namespace_module before it was removed from the constant tree.

  • relative_name (String)

    The name of the constant under parent_module where namespace_module was attached.

  • namespace_module (Module, nil)

    The previous namespace module containing the old module content. If 'nil`, then the relative_name constant is removed from parent_module, but nothing is set as the new constant.



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# File 'lib/msf/core/modules/loader/base.rb', line 609

def restore_namespace_module(parent_module, relative_name, namespace_module)
  if parent_module
    # If there is a current module with relative_name
    if parent_module.const_defined?(relative_name)
      # if the current value isn't the value to be restored.
      if parent_module.const_get(relative_name) != namespace_module
        # remove_const is private, so use send to bypass
        parent_module.send(:remove_const, relative_name)

        # if there was a previous module, not set it to the name
        if namespace_module
          parent_module.const_set(relative_name, namespace_module)
        end
      end
    else
      # if there was a previous module, but there isn't a current module, then restore the previous module
      if namespace_module
        parent_module.const_set(relative_name, namespace_module)
      end
    end
  end
end

#script_path?(path) ⇒ Boolean (protected)

Tries to determine if a file might be executable,

Returns:

  • (Boolean)


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# File 'lib/msf/core/modules/loader/base.rb', line 483

def script_path?(path)
  File.file?(path) &&
    File.executable?(path) &&
    ['#!', '//'].include?(File.read(path, 2))
end

#typed_path(type, module_reference_name) ⇒ String (protected)

Note:

To get the full path to the module, use #module_path.

The path to the module qualified by the type directory.

Parameters:

  • type (String)

    The type of the module.

  • module_reference_name (String)

    The canonical name for the module.

Returns:

  • (String)

    path to the module starting with the type directory.



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# File 'lib/msf/core/modules/loader/base.rb', line 653

def typed_path(type, module_reference_name)
  self.class.typed_path(type, module_reference_name)
end